This TCW Expansion Block is engineered for precise vehicle fitment and superior performance. Precise fitment makes it easy to install, and the superior performance will help cool your vehicle longer. Manufactured to withstand the toughest climates and will help cool your vehicle year round. A TCW Expansion Block is the smart choice for your A/C parts replacement. Choose smart, choose TCW. When replacing your A/C parts, make sure to follow all installation instructions and your air conditioning will work like a brand new car.